Seat, in particular an office chair

Abstract

The invention relates to a seat ( 1 ), in particular an office chair, comprising a seat support ( 3 ) for a seating surface ( 6 ) and comprising a backrest support ( 4 ) of a backrest ( 5 ), which is held on the seat support ( 3 ) so as to be able to move in a tiltable manner to the side, wherein the backrest support ( 4 ) comprises two support arms ( 4 a, 4 b ) which are configured to be flexible and/or articulated laterally and spaced apart from one another. Preferably, the seating surface ( 6 ) and/or the backrest ( 5 ) comprises a curved seat shell and/or backrest shell ( 6 a, 5 a ) provided with a cover ( 6 b, 5 b ) with a number of flexible curved ribs ( 15, 16 ) on the edge of the shell, wherein the cover is stretched by the seat shell and/or backrest shell ( 6 a, 5 a ) such that when the cover ( 6 b, 5 b ) is loaded, the bending of the curved ribs ( 15, 16 ) is altered.

The invention claimed is: 
     
       1. A seat ( 1 ), in particular an office chair, comprising a seat support ( 3 ) for a seating surface ( 6 ) and comprising a backrest support ( 4 ) of a backrest ( 5 ) which is held on the seat support ( 3 ) so as to be able to move relative to the seat support ( 3 ), the backrest ( 5 ) comprising a curved shell ( 5   a ) having a plurality of flexible curved ribs ( 16 ) on a peripheral side of the curved shell ( 5   a ) formed by a plurality of slots ( 18 ) incorporated on said peripheral side, the flexible curved ribs ( 16 ) extending convexly forward relative to a regular sitting direction, toward the seating surface ( 6 ), and a backrest opening ( 19 ) formed by a central recess in the curved shell ( 5   a ), wherein the backrest support ( 4 ) comprises two support arms ( 4   a ,  4   b ) which extend along and adjacent to at least two respective vertical, opposing sides of the backrest opening ( 19 ). 
     
     
       2. The seat ( 1 ) as claimed in  claim 1 , wherein the support arms ( 4   a ,  4   b ) in a vertical direction (z) extend in a V-shape with a spacing (a 1 , a 2 ) increasing toward a connection ( 9 ) thereof to the backrest ( 5 ). 
     
     
       3. The seat ( 1 ) as claimed in  claim 1 , wherein the support arms ( 4   a ,  4   b ) extend in a direction (x) in this case in a V-shape. 
     
     
       4. The seat ( 1 ) as claimed in  claim 3 , wherein the support arms ( 4   a ,  4   b ) extend toward one another relative to a mean perpendicular (S) to a normal (N) of the seating surface ( 6 ) extending between said support arms. 
     
     
       5. The seat ( 1 ) as claimed in  claim 1 , wherein a support arm depth (d 1 , d 2 ) of the support arms ( 4   a ,  4   b ) in a region of a connection ( 9 ) to the backrest ( 5 ) is smaller than in a region of a connection thereof ( 10 ) to the seat support ( 3 ). 
     
     
       6. The seat ( 1 ) as claimed in  claim 5 , wherein the support arm depth (d 1 , d 2 ) continuously reduces from the seat support ( 3 ) in a vertical direction. 
     
     
       7. The seat ( 1 ) as claimed in  claim 5 , wherein a support arm width (b) is greater than the support arm depth (d 1 , d 2 ) of the support arms ( 4   a ,  4   b ). 
     
     
       8. The seat ( 1 ) as claimed in  claim 1 , wherein the seating surface ( 6 ) is configured as a curved support shell ( 6   a ) provided with a cover ( 6   b ) with a number of flexible curved ribs ( 15 ) on an edge of the support shell, wherein the cover ( 6   b ) is stretched by the support shell ( 6   a ) such that when the cover ( 6   b ) is loaded, the bending of the curved ribs ( 15 ) and/or the support shell ( 6   a ) is altered. 
     
     
       9. The seat ( 1 ) as claimed in  claim 1 , wherein the backrest ( 5 ) is provided with a cover ( 5   b ), wherein the cover is stretched by the curved shell ( 5   a ) such that when the cover ( 5   b ) is loaded, the bending of the curved ribs ( 16 ) and/or the curved shell ( 5   a ) is altered. 
     
     
       10. The seat ( 1 ) as claimed in  claim 8 , wherein the support shell ( 6   a ) of the seating surface ( 6 ) comprises a central recess which forms a seat opening ( 17 ) on a side of the support shell ( 6   a ) which is covered by means of the cover ( 6   b ). 
     
     
       11. The seat ( 1 ) as claimed in  claim 1 , wherein the backrest support ( 4 ) further comprises a connecting element ( 9 ) that flanks the backrest opening ( 19 ) at a top thereof substantially horizontally. 
     
     
       12. The seat ( 1 ) as claimed in  claim 10 , wherein supporting webs ( 17   a ,  17   b ) are connected to the support shell ( 6   a ) along a side of the seat opening ( 17 ). 
     
     
       13. The seat ( 1 ) as claimed in  claim 12 , wherein the backrest support ( 4 ) is of L-shaped configuration with a substantially vertical L-shaped limb forming the support arms ( 4   a ,  4   b ) and with a substantially horizontal L-shaped limb ( 4   c ) which extends below the seating surface ( 6 ). 
     
     
       14. The seat ( 1 ) as claimed in  claim 12 , wherein the supporting webs ( 17   a ,  17   b ) are connected in an articulated manner in the front region of the seat opening ( 17 ) remote from the backrest ( 5 ) to the horizontal L-shaped limb ( 4   c ). 
     
     
       15. The seat ( 1 ) as claimed in  claim 1 , wherein the curved shell ( 5   a ) is integrally formed with at least a portion of the backrest support ( 4 ). 
     
     
       16. The seat ( 1 ) as claimed in  claim 1 , wherein the curved ribs ( 16 ) are flexible with respect to the curved shell ( 5   a ). 
     
     
       17. The seat ( 1 ) as claimed in  claim 1  wherein a length of the two support arms ( 4   a ,  4   b ) is greater than a spacing between the two support arms. 
     
     
       18. An office chair comprising:
 a seat support ( 3 ) for a seating surface ( 6 ); 
 a backrest support ( 4 ) coupled with the seat support ( 3 ) so as to be able to move relative to the seat support ( 3 ), the backrest support ( 4 ) comprising two support arms ( 4   a ,  4   b ) defining an opening; 
 a backrest cover ( 5   b ); and 
 a plurality of flexible curved ribs ( 16 ) separated by a plurality of slots ( 18 ), the plurality of slots ( 18 ) extending at least partially between each of the two support arms ( 4   a ,  4   b ) and the cover ( 5   b ), the flexible curved ribs ( 16 ) extending convexly forward relative to a regular sitting direction, toward the seating surface ( 6 ), 
 wherein the backrest cover ( 5   b ) is attached to the flexible curved ribs ( 16 ) to support the backrest cover ( 5   b ) relative to the backrest support ( 4 ) and wherein a bending of at least some of the plurality of flexible curved ribs ( 16 ) is altered when the cover ( 5   b ) is loaded. 
 
     
     
       19. The office chair as claimed in  claim 18 , wherein the seating surface ( 6 ) is configured as a curved support shell ( 6   a ) provided with a cover ( 6   b ) with a number of flexible curved ribs ( 15 ) on an edge of the support shell, wherein the cover ( 6   b ) is stretched by the support shell ( 6   a ) such that when the cover ( 6   b ) is loaded, the bending of the curved ribs ( 15 ) and/or the support shell ( 6   a ) is altered. 
     
     
       20. The office chair as claimed in  claim 19 , wherein the support shell ( 6   a ) of the seating surface ( 6 ) comprises a central recess which forms a seat opening ( 17 ) on a side of the support shell ( 6   a ) which is covered by means of the cover ( 6   b ). 
     
     
       21. The office chair as claimed in  claim 18 , wherein the backrest support ( 4 ) further comprises a connecting element ( 9 ) extending between upper ends of the two support arms ( 4   a ,  4   b ) and flanks the opening at a top thereof substantially horizontally.